• After more than a decade of ruling the roads with their famous 440 Series shocks with IAS, Progressive Suspension has unveiled another breakthrough design• It is dubbed Frequency Sensing Technology (FST) for its unique ability to dynamically adjust damping as you ride• Frequency Sensing Technology allows the shocks to sense the frequency of a bump and automatically adjust damping for superior ride quality• These shocks also feature deflective disc valving, hand adjustable spring pre-load (no special tools needed), and progressive rate springs• High pressure gas charged for consistent performance• Sold in pairs• Lifetime Limited Warranty Don't go from store to store to find the best prices, we've got them here! Outlet Sale Progressive Suspension 444 Black 12" Standard Duty Shocks - 444-4068B
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